Caliper-square.



R. B. WARE.

OALIPER SQUARE.

ArrmoATIoN FILED JAN. zo, 1908. nmmwnn JUNE 16, 1 909.

Patented Jan. 4, 1910.

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CALIPER-SQUARE.

Specification of Letters Patent.

Patented Jan. 4, 1910.

Application filed. January 20, 1908, Serial No. 411,615. Renewed June15, 1909. Serial No. 502,333.

To all whom it may concern:

Be it known that I, Romsey B. lVARn, a citizen of the United States,residing in the borough of Brooklyn, city, county, and State of NewYork, have invented certain new and useful Improvements inCaliper-Squares, of which the following is a specification, referencebeing had therein to the accompanying drawing.

This invention relates to an improvement in beam micrometer calipersquares, and

,more particularly to the details of the yoke and sliding jaw or bladeof the caliper.

The object of the invention is to provide a caliper of large measuringcapacity without increasing the length of beam and to provide a screwadjusting movable blade with but one yoke, and to produce a caliperwithout any threads exposed to collect dust.

The invention accordingly consists in the features of construction,combination of elements, and arrangement of parts, which will beexemplified in the mechanism hereinafter described and the scope of theapplication of which will be indicated in the claims.

The foregoing and other features of my invention will now be describedin connection with the accompanying one sheet of drawings forming partof the specification, in which I have represented my caliper embodyingthe improvements in the preferred form, after which I shall point out inthe claims those features which I believe to be new and of my owninvention.

Referring to the accompanying drawing in which similar' characters of re.erence indicate like parts throughout the several views, Figure 1 is aside elevation of my beam caliper square, Fig. 2 a top view thereof,Fig. 3 is an end view. Fig. 4 is a section through block. Figs. 5 and 6are details which I em loy.

Slidably mounted on beam 1 is the yoke 2 carrying the blade 3 which ischaracteristic of all micrometer caliper squares. Mounted in yoke 2 aretwo straddle pins 7 provided with notches 8, detail of which is shown inFig. 6, forming a bearing surface against which the beam 1 is locked byset screw 4. Set screw 4 bears down against bushing 6 instead ofdirectly against the beam, thereby saving the blade from wear and tear.The bushing is renewable, as will be readily understood. On upper end ofthe yoke 2 is a set screw 5 which bears against blade 3 through bushing9 and locks the blade in its adjusted position. The blade 3 is providedwith a notch 10 and bearings 11 and 12 in which is mounted 011 screw 13the knurled micrometer ring 16 which is provided with a sectionaladjustable nut to insure a perfect lit to screw 13. The screw 13 isfastened in yoke 2 by means of pin 17 and is carried by bearings 11 and12.

Referring more particularly to Fig. 4 for details of the sectionaladjustable nut it will be seen that the knurled micrometer ring haswithin it two threaded nuts 14 and 15. The nut 15 is pressed in the ring16 and is a tight lit. The nut 14 is slotted on one end and is splitclear through on one side as will be clearly seen by referring to Fig.5. This nut is a wringing lit in the knurled ring and is pressed upclose to the nut 15 and is turned in adjusted position by means of ascrew driver to be placed in the slot across the end. The object of thisnut is to serve as a tension, thereby securing the desired fit on thescrew and also to provide a means to take up any lost motion due to thewear of the screw or nut. To make the complete nut fit snugly in thenotch 10 both inside nuts are forced through the outside ring whichprovides a means for increasing the over-all length of the complete nut.The micrometer ring is provided with the usual scale which passes a markon the stationary bearing 12. This feature is common to all micrometertools and need not, therefore, be more minutely described. For thepurpose of clearness I will define wringing fit as a tight twist litalmost a driving fit. The blade 3 is notched so as to straddle the pins7 and a projection 19 is provided which bears against the beam betweenthe pins. This distributes the pressure on the blade and prevents thetendency to buckle when the thumb screw 5 is set down hard. On bothsides of the blade 3 I provide an L-shaped indicator 21 fastened bymeans of screw 22 and pins as shown or by any other means. The object ofthis indicator is to provide a means for utilizing all four edges of thebeam for graduations which may be in various scales, inches,millimeters,

etc., as may be desired.

It will be noted that all threads are completely covered, which is mostdesirable in all instruments of precision. The Unthreaded portions ofthe stem of the set screws fit into a counter-bored recess in the yoke.The remaining threaded portion being thus entirely inclosed to insuresuicient adjustment of screw without exposing its thread, as will bereadily understood.

To set the tool, slide the blade tothe approximate measurement and clampthe yoke to the beam by means of set screw 4. Then adjust the blade bymeans of the knurled micrometer ring and clamp to the adjusted positionby means of set screw 5.

I am well aware that micrometer calipers have been placed on the marketwith two yokes, one of which carries the micrometer. adjustment, but Iknow of no construction in which the blade carries the micrometer nurland is movably mounted therein, and a single yoke. The latter featureprovides an increased adjusting capacity over the old calipers now onthe market, as will be readily seen by referring to Fig. 4l, where inthis position the ordinary adjusting yoke would be entirely ofi' thebeam.

I wish it distinctly understood that my caliper` square hereinillustrated and described, is in the form which I desire to constructit, and that any changes or variations may be made as may be convenientor desirable without departing from the salient features of my inventionand I therefore intend the following claims to cover such modificationas naturally fall within the lines of invention.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is,-

l. In a micrometer caliper square in comy bination, a graduated beam, ayoke slidably mounted thereon and provided with a screw fastenedthereto, a notched blade provided with a micrometer ring containing' asectional nut adjustable to fit the aforementioned screw and notch andmeans contained in the yoke to clamp the blade in its adjusted position.Y

2. In a measuring instrument, a micrometer ring provided with a tighttting nut against which is pressed a split nut.

3. In a micrometer caliper square, a graduated beam with sliding yokeand blade in combination with L-shaped runners one on each side of theblade providing for four sets of graduations on beam.

4. In a micrometer caliper square in combination, a graduated beam, ayoke slidably mounted thereon provided with a screw fastened thereto andpins adapted to straddle the beam, a notched blade which straddles thebefore-mentioned pins provided with a micrometer ring containing asectional nut adjustable to fit the afore-menticned screw and notch; aset screw in each end of the yoke, one bearing indirectly on the blade,the other bearing indirectly on they beam, whereby the blade may befastened to the beam and the beam to the yoke through the pins.

5. In a caliper square a graduated beam and sliding blade in combinationwith a yoke provided with pins notched to straddle the blade, a setscrew in the aforementioned yoke whereby the beam is clamped against thestraddle pins.

6. In a caliper square in combination a graduated beam, a yoke providedwith pins notched to straddle the beam, a sliding blade provided withnotches which straddle the aforementioned pins.

This specification signed and witnessed this 15th day of January, A. D.,1908.

RODNEY B. VARE.

In presence of EDWD. VAN IVINKLE, MARGUERITE Ross.

